fix: update API endpoints in AuthRepository and RecipeRepository to remove redundant '/api' prefix

flutter/lib/features/auth/data/auth_repository.dart

@@ -10,7 +10,7 @@ class AuthRepository {
 
   Future<String> login(String email, String password) async {
     final response = await _api.post(
-      '/api/auth/login',
+      '/auth/login',
       jsonEncode({'email': email, 'password': password}),
     );
     if (response.statusCode != 200 && response.statusCode != 201) {

flutter/lib/features/recipes/data/recipe_repository.dart

@@ -8,7 +8,7 @@ class RecipeRepository {
   RecipeRepository(this._api);
 
   Future<List<Recipe>> fetchRecipes({String? token}) async {
-    final response = await _api.get('/api/recipes', token: token);
+    final response = await _api.get('/recipes', token: token);
     if (response.statusCode != 200) {
       throw Exception('Failed to load recipes: ${response.statusCode}');
     }